WTW PH 3110 Operating Manual WTW_p H_3110 P H

User Manual: Pdf WTW_pH_3110

Open the PDF directly: View PDF PDF.
Page Count: 50

ba75791e05 05/2011
pH 3110
Operating manual
pH meter
6
8
4
2
2
9
9
pH
°C
TP
AR
For Sales & Service Contact
2650 E. 40th Ave. • Denver, CO 80205
Phone 303-320-4764 • Fax 303-322-7242
1-800-833-7958
www.geotechenv.com
pH 3110
ba75791e05 05/2011
Accuracy when
going to press
The use of advanced technology and the high quality standard of our
instruments are the result of a continuous development. This may result in
differences between this operating manual and your meter. Also, we cannot
guarantee that there are absolutely no errors in this manual. Therefore, we
are sure you will understand that we cannot accept any legal claims resulting
from the data, figures or descriptions.
Copyright © Weilheim 2008, WTW GmbH
Reproduction in whole - or even in part - is prohibited without the express
written permission of WTW GmbH, Weilheim.
Printed in Germany.
pH 3110 Contents
3
ba75791e05 05/2011
pH 3110 - Contents
1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.2 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.3 Socket field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1 Authorized use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.2 General safety instructions . . . . . . . . . . . . . . . . . . . . . . . 10
3 Commissioning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.1 Scope of delivery. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.2 Initial commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.2.1 Inserting the batteries. . . . . . . . . . . . . . . . . . . . . 13
3.2.2 Switching on the meter. . . . . . . . . . . . . . . . . . . . 14
4 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.1 General operating principles . . . . . . . . . . . . . . . . . . . . . . 15
4.1.1 Operating modes . . . . . . . . . . . . . . . . . . . . . . . . 15
4.1.2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.2 Measuring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.2.1 Measuring the pH value . . . . . . . . . . . . . . . . . . . 17
4.2.2 Measuring the ORP . . . . . . . . . . . . . . . . . . . . . . 18
4.3 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.3.1 Calibration interval (Int.C) . . . . . . . . . . . . . . . . . 21
4.3.2 Automatic calibration (AutoCal) . . . . . . . . . . . . . 22
4.3.3 Conventional calibration (ConCal) . . . . . . . . . . . 24
4.4 Downloading calibration data . . . . . . . . . . . . . . . . . . . . . 27
4.5 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.5.1 System settings . . . . . . . . . . . . . . . . . . . . . . . . . 29
4.5.2 Measurement settings . . . . . . . . . . . . . . . . . . . . 30
4.6 Reset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
4.6.1 Resetting calibration values . . . . . . . . . . . . . . . . 34
4.6.2 Resetting all meter settings . . . . . . . . . . . . . . . . 35
5 Maintenance, cleaning, disposal. . . . . . . . . . . . . . . . . 37
5.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
5.1.1 Replacing the batteries . . . . . . . . . . . . . . . . . . . 37
5.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
5.3 Packing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Contents pH 3110
4ba75791e05 05/2011
5.4 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
6 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
7 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
7.1 General data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
7.2 Measuring ranges, resolution, accuracy . . . . . . . . . . . . . 44
8 Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
pH 3110 Overview
5
ba75791e05 05/2011
1Overview
The compact pH 3110 precision pH meter enables you to perform pH
measurements rapidly and reliably. The pH 3110 provides the
maximum degree of operating comfort, reliability and measuring
certainty for all applications.
The proven calibration procedures and automatic stability control
function (AR) support your work with the pH meter.
1Keypad
2Display
3Socket field
1
2
3
6
8
4
2
2
9
9
pH
°C
TP
AR
Overview pH 3110
6ba75791e05 05/2011
1.1 Keypad
In this operating manual, keys are indicated by brackets <..> .
The key symbol (e.g. <ENTER>) generally indicates a short keystroke
(under 2 sec) in this operating manual. A long keystroke (approx.
2 sec) is indicated by the underscore behind the key symbol (e.g.
<ENTER_>).
<On/Off>:
<On/Off_>:
Switches the meter on/off
Resets calibration data
<M>:
<M_>:
Selects the measured parameter
Opens the setting menu for
calibration and measurements
<CAL>:
<CAL_>:
Calls up the calibration procedure
Displays the calibration data
<▲>: Increments values, scrolls
<▼>: Decrements values, scrolls
<ENTER>:
<ENTER_>
:
Confirms entries
Opens the setting menu for system
settings
pH 3110
pH 3110 Overview
7
ba75791e05 05/2011
1.2 Display
Function display
indicators
Status display
Sensor symbol
(calibration
evaluation)
Measured value
display
Function and
temperature display
indicators
AutoCal TEC Calibration with automatic buffer recognition
(buffer set: Technical buffers )
AutoCal DIN Calibration with automatic buffer recognition
(buffer set: DIN buffers )
ConCal Calibration with any buffers
CalError An error occurred during calibration
LoBat With battery operation: Batteries almost empty
AR Stability control (AutoRead) is active
TP Temperature measurement active
TIME Setting of calibration interval
Overview pH 3110
8ba75791e05 05/2011
1.3 Socket field
Caution
Only connect sensors to the meter that cannot return any voltages
or currents that are not allowed (> SELV and > current circuit with
current limiting).
Almost all customary sensors fulfill these conditions.
Connectors:
1pH electrode
2Reference electrode
3Temperature sensor
4Service interface
4123
pH 3110 Safety
9
ba75791e05 05/2011
2 Safety
This operating manual contains basic instructions that you must follow
during the commissioning, operation and maintenance of the meter.
Consequently, all responsible personnel must read this operating
manual before working with the meter.
The operating manual must always be available within the
vicinity of the meter.
Target group The meter was developed for work in the field and in the laboratory.
Thus, we assume that, as a result of their professional training and
experience, the operators will know the necessary safety precautions
to take when handling chemicals.
Safety instructions Safety instructions in this operating manual are indicated by the
warning symbol (triangle) in the left column. The signal word (e.g.
"Caution") indicates the level of danger:
Warning
indicates instructions that must be followed precisely in order to
avoid possibly great dangers to personnel.
Caution
indicates instructions that must be followed precisely in order to
avoid the possibility of slight injuries or damage to the meter or
the environment.
Further notes
Note
indicates notes that draw your attention to special features.
Note
indicates cross-references to other documents, e.g. operating
manuals.
Safety pH 3110
10 ba75791e05 05/2011
2.1 Authorized use
This meter is authorized exclusively for pH and ORP measurements in
a laboratory or field environment.
The technical specifications as given in chapter 7 TECHNICAL DATA must
be observed. Only the operation and running of the meter according to
the instructions given in this operating manual is authorized.
Any other use is considered unauthorized.
2.2 General safety instructions
This meter is constructed and tested in compliance with the IEC 1010
safety regulations for electronic measuring instruments.
It left the factory in a safe and secure technical condition.
Function and
operational safety
The smooth functioning and operational safety of the meter can only be
guaranteed if the generally applicable safety measures and the specific
safety instructions in this operating manual are followed during
operation.
The smooth functioning and operational safety of the meter can only be
guaranteed under the environmental conditions that are specified in
chapter 7 TECHNICAL DATA.
If the meter was transported from a cold environment to a warm
environment, the formation of condensate can lead to the faulty
functioning of the meter. In this event, wait until the temperature of the
meter reaches room temperature before putting the meter back into
operation.
Caution
The meter is only allowed to be opened by authorized personnel.
pH 3110 Safety
11
ba75791e05 05/2011
Safe operation If safe operation is no longer possible, the meter must be taken out of
service and secured against inadvertent operation!
Safe operation is no longer possible if the meter:
-has been damaged in transport
-has been stored under adverse conditions for a lengthy period of
time
-is visibly damaged
-no longer operates as described in this manual.
If you are in any doubt, please contact the supplier of the meter.
Obligations of the
purchaser
The purchaser of this meter must ensure that the following laws and
guidelines are observed when using dangerous substances:
-EEC directives for protective labor legislation
-National protective labor legislation
-Safety regulations
-Safety datasheets of the chemical manufacturers.
Caution
In addition to the safety instructions mentioned here, also follow
the safety instructions of the sensors used.
The operating manuals of the sensors are available on the
supplied CD and on the Internet under www.WTW.com.
Safety pH 3110
12 ba75791e05 05/2011
pH 3110 Commissioning
13
ba75791e05 05/2011
3 Commissioning
3.1 Scope of delivery
-Handheld meter, pH 3110
-4 batteries 1.5 V Mignon type AA
-Short instructions
-CD-ROM with detailed operating manual
3.2 Initial commissioning
Perform the following activities:
-Insert the supplied batteries
-Switch on the meter
3.2.1 Inserting the batteries
1Unscrew the two screws (1) on the underside of the meter.
2 Open the battery compartment (2) on the underside of the
meter.
3Place four batteries (type Mignon AA) in the battery
compartment.
2
1
Commissioning pH 3110
14 ba75791e05 05/2011
Note
Alternatively, you can also use Ni-MH rechargeable batteries (type
Mignon AA). In order to charge the batteries, an external charging
device is required.
Caution
Make sure that the poles of the batteries are positioned correctly.
The ± signs on the batteries must correspond to the ± signs in the
battery compartment.
3.2.2 Switching on the meter
Note
The meter has an energy saving feature to avoid unnecessary battery
depletion during battery operation.
The energy saving feature switches off the meter if no key was pressed
during the specified interval (setting the switch-off interval see section
4.5.1).
4Close the battery compartment (2) and tighten the screws (1).
1Press the <On/Off> key.
A display test is briefly displayed.
Subsequently, the meter switches to the measuring mode
(measured value display).
pH 3110 Operation
15
ba75791e05 05/2011
4 Operation
4.1 General operating principles
This section contains basic information on the operation of the
pH 3110.
4.1.1 Operating modes
The meter has the following operating modes:
-Measurement
The display indicates the measurement data in the measured value
display
-Calibration
The display guides you through a calibration procedure with
calibration information
-Configuration
The system menu or a sensor menu with submenus, settings and
functions is displayed
4.1.2 Operation
Keys The meter is operated via keys. The keys can have different functions
with long or short keystrokes.
Functions Generally, with a short keystroke a function is carried out. A long
keystroke opens a setting menu.
In a setting menu, settings are selected with the <▲><▼> keys.
A setting is confirmed with <ENTER>. With confirming, the setting is
finished and the next setting is displayed.
Representation In this operating manual, keys are indicated by brackets <..> .
The key symbol (e.g. <ENTER>) generally indicates a short keystroke
(under 2 sec) in this operating manual. A long keystroke (approx.
2 sec) is indicated by the underscore behind the key symbol (e.g.
<ENTER_>).
Operation pH 3110
16 ba75791e05 05/2011
4.2 Measuring
Preparatory activities Perform the following preparatory activities when you want to measure:
Note
Incorrect calibration of pH combination electrodes leads to incorrect
measured values. Calibrate regularly before measuring.
Stability control
AutoRead
During the measuring procedure, the stability control function is
automatically activated. The stability control function (drift control)
checks the stability of the measured pH signal and the stability of the
measured temperature signal. The stability has a considerable effect
on the reproducibility of the measured value.
For identical measurement conditions, the following applies:
Temperature sensor You can measure with or without a temperature sensor. If a
temperature sensor is connected, it is indicated on the display by TP.
Note
The pH meter automatically recognizes the type of the temperature
sensor used. Therefore, you can connect combination electrodes with
an NTC30 or Pt1000.
The temperature measurement is absolutely essential for a
reproducible pH measurement. If the measurement is made without a
temperature sensor, proceed as follows:
1Connect the pH combination electrode to the meter.
2 Adjust the temperature of the buffer solutions or test solutions,
or measure the current temperature, if you measure without a
temperature sensor.
3Calibrate or check the meter with the combination electrode.
4 Select the measured parameter with <M>.
Measured
parameter
Reproducibility Response time
pH value < 0.02 pH units > 15 seconds
Temperature < 0.3 °C of temperature value > 15 seconds
1Measure the current temperature using a thermometer.
2 Set the temperature value with <▲><▼>.
pH 3110 Operation
17
ba75791e05 05/2011
Note
When calibrating without temperature sensor, also set the current
temperature of each buffer solution manually with the <▲><▼> keys.
4.2.1 Measuring the pH value
1Perform the preparatory activities according to section 4.2.
2 Immerse the pH combination electrode in the test sample.
3Using <M>, scroll as necessary until the measured parameter
pH is displayed.
4 Wait for a stable measured value.
The AR display indicator flashes as long as the measured
value is not yet stable.
Operation pH 3110
18 ba75791e05 05/2011
4.2.2 Measuring the ORP
The meter can, in conjunction with an ORP electrode, measure the
ORP (mV) of a solution.
Note
ORP electrodes are not calibrated. However, you can check ORP
electrodes using a test solution.
1Perform the preparatory activities according to section 4.2.
2 Immerse the ORP electrode in the test sample.
3If necessary, call up the measured parameter U with <M>.
4 Wait for a stable measured value.
The AR display indicator flashes as long as the measured
value is not yet stable.
pH 3110 Operation
19
ba75791e05 05/2011
4.3 Calibration
Why calibrate? pH combination electrodes age. This changes the zero point
(asymmetry) and slope of the pH combination electrode. As a result, an
inexact measured value is displayed. Calibration determines the
current values of the zero point and slope of the combination electrode
and stores them in the measuring instrument. Thus, you should
calibrate at regular intervals.
When do you have to
calibrate?
-After connecting another combination electrode
-When the sensor symbol flashes on the display:
– e.g. after the calibration interval has expired
AutoCal is adapted to the permanently programmed buffer solutions as a fully
automatic single-point, two-point or three-point calibration. The buffer
solutions are automatically recognized by the meter.
The following buffer sets are suitable:
-Technical buffers (AutoCal TEC)
-DIN buffers (AutoCal DIN)
Calibration points Calibration can be performed using one, two or three buffer solutions in
any order (single-point, two-point or three-point calibration). The meter
determines the following values and calculates the calibration line as
follows:
Note
You can display the slope in the units, mV/pH or %.
You can display the zero point in the units, mV or pH.
ConCal This function is a conventional two-point calibration using two buffer
solutions (pH 7.0 ± 0.5 and any other buffer solution) or a single-point
calibration using any buffer solution and is used as a high-speed
method.
Stability control
AutoRead
The calibration procedure automatically activates the stability control
function. The current measurement with stability control can be
terminated at any time (accepting the current value) by pressing
<ENTER>.
Determined values Displayed calibration data
1-point ASY -Zero point = ASY
-Slope = Nernst slope
(-59.16 mV/pH at 25 °C)
2-point
3-point
ASY
SLO
-Zero point = ASY
-Slope = SLO
Operation pH 3110
20 ba75791e05 05/2011
Calibration record When finishing a calibration, the new calibration values are first
displayed as an informative message and stored.
Displaying the
calibration data
You can display the data of the last calibration (see section 4.4).
Calibration evaluation After calibrating, the meter automatically evaluates the calibration. The
zero point and slope are evaluated separately. The worse evaluation of
both is taken into account. The evaluation appears on the display as
the sensor symbol and in the calibration record.
Preparatory activities
Sensor symbol Zero point
[mV]
Slope
[mV/pH]
-15 ... +15 -60.5 ... -58
-20 ... +20 -58 ... -57
-25 ... +25 -61 ... -60.5
or
-57 ... -56
Clean the combination electrode
according to the electrode operating
manual
-30 ... +30 -62 ... -61
or
-56 ... -50
CalError < -30 or
> 30
... -62 or
... -50
Eliminate the error according to
chapter 6 WHAT TO DO IF...
1Switch on the meter with <On/Off>.
2 Connect the pH combination electrode to the meter.
3Keep the buffer solutions ready.
4 Adjust the temperature of the solutions and measure the
current temperature if the measurement is made without
temperature sensor.
pH 3110 Operation
21
ba75791e05 05/2011
4.3.1 Calibration interval (Int.C)
The calibration interval reminds you to calibrate regularly. When the
adjusted calibration interval (Int.C) has expired, the sensor symbol
flashes. It is still possible to measure.
Note
To ensure the high measuring accuracy of the measuring system,
calibrate after the calibration interval has expired.
Setting the calibration
interval
The calibration interval (Int.C) is set to 7 days (d7) in the factory.
You can change the interval (1 ... 999 days):
5Set the buffer set to be used for calibration as necessary.
1Open the menu for measurement settings with <M_>.
2 Confirm all settings with <ENTER> until Int.C is displayed.
3Set the calibration interval with <▲><▼>.
4 Confirm the setting with <ENTER>.
8
D
C
T
N
1
pH
Time
Operation pH 3110
22 ba75791e05 05/2011
4.3.2 Automatic calibration (AutoCal)
For the AutoCal TEC and AutoCal DIN procedures, use one to three
buffer solutions of the relevant buffer set (Technical buffers or DIN
buffers) in any order.
Note
The steps 2 and 6 are not necessary if you use a temperature sensor.
1Press <CAL> repeatedly until the AutoCal TEC or AutoCal DIN
function display indicator appears.
8
4
2
1
T
C
°C
pH
AutoCal TEC
TP
8
4
2
I
D
C
°C
pH
AutoCal DIN
TP
2If necessary, set the temperature of the buffer solution with
<▲><▼>.
3 Immerse the pH combination electrode in the first buffer
solution.
4Start the measurement with <ENTER>.
The AR display indicator flashes.
The electrode voltage (mV) or the nominal value of the buffer
(setting: see section 4.5.2) is displayed. As soon as a stable
value is recognized, Ct2 or Cd2 appears.
8
4
2
2
T
C
°C
pH
AutoCal TEC
TP
8
4
2
2
D
C
°C
pH
AutoCal DIN
TP
pH 3110 Operation
23
ba75791e05 05/2011
Note
Here you can cancel the calibration procedure with <M>. This
corresponds to a single-point calibration. The value of the zero point
(ASY) is displayed. Pressing <ENTER> displays the value of the slope
(SLO).
Continuing with two-
point calibration
Note
Here you can cancel the calibration procedure with <M>. This
corresponds to a two-point calibration. The value of the zero point
(ASY) is displayed. Pressing <ENTER> displays the value of the slope
(SLO).
Continuing with three-
point calibration
5Thoroughly rinse the combination electrode with distilled water.
6 If necessary, set the temperature of the second buffer solution
with <▲><▼>.
7Immerse the combination electrode in the second buffer
solution.
8 Press the <ENTER> key.
The AR display indicator flashes.
The electrode voltage (mV) or the nominal value of the buffer
(setting: see section 4.5.2) is displayed. As soon as a stable
value is recognized, Ct3 or Cd3 appears.
8
4
2
3
T
C
°C
pH
AutoCal TEC
TP
8
4
2
3
D
C
°C
pH
AutoCal DIN
TP
9Thoroughly rinse the combination electrode with distilled water.
10 If necessary, set the temperature of the third buffer solution
with <▲><▼>.
11 Immerse the combination electrode in the third buffer solution.
Operation pH 3110
24 ba75791e05 05/2011
Note
While the zero point (ASY) is being displayed, you can change the unit
of the zero point with <▲><▼>.
While the slope (SLO) is being displayed, you can change the unit of
the slope with <▲><▼>.
The % display refers to the Nernst slope of 59.2 mV/pH at 25° C
(100 x determined slope/Nernst slope).
The unit of zero point and slope can also be changed permanently in
the measurement settings (see section 4.5.2).
4.3.3 Conventional calibration (ConCal)
Single-point calibration Use any buffer solution for this rapid method.
The calibration will be the more exact the nearer the pH value of the
buffer solution is to that of the test sample.
Two-point calibration Use two buffer solutions for this procedure:
-pH 7.0 ± 0.5
-any other buffer solution
Note
The steps 2 and 8 are not necessary if you use a pH combination
electrode with a temperature sensor.
12 Press the <ENTER> key.
The AR display indicator flashes.
The electrode voltage (mV) or the nominal value of the buffer
(setting: see section 4.5.2) is displayed. The asymmetry is
displayed as soon as a stable value is recognized.
13 Press the <ENTER> key.
The value of the slope (mV/pH) appears on the display.
14 To return to the measuring mode: Press the <ENTER> key.
1Press the <CAL> key repeatedly until the ASY display indicator
and the ConCal function indicator appear.
pH 3110 Operation
25
ba75791e05 05/2011
Note
Here you can cancel the calibration procedure with <M>. This
corresponds to a single-point calibration. The value of the zero point
(ASY) is displayed. The sensor symbol shows the evaluation of the
single-point calibration. Pressing <ENTER> displays the value of the
slope (SLO).
2If necessary, set the temperature of the first buffer solution with
<▲><▼>.
3 Immerse the pH combination electrode in the first buffer
solution (pH 7.0 ± 0.5 for two-point calibration).
4Press the <ENTER> key.
The measured pH value appears on the display.
5 When the measured value is stable,
using <▲><▼>, set the measured value to the nominal pH
value of the buffer solution (at the current temperature).
6Press the <ENTER> key. SLO appears on the display.
Operation pH 3110
26 ba75791e05 05/2011
Note
While the zero point (ASY) is being displayed, you can change the unit
of the zero point with <▲><▼>.
While the slope (SLO) is being displayed, you can change the unit of
the slope with <▲><▼>.
The % display refers to the Nernst slope of 59.2 mV/pH at 25° C
(100 x determined slope/Nernst slope).
The units of the zero point and slope can also be changed permanently
in the measurement settings (see section 4.5.2).
7To continue the two-point calibration, thoroughly rinse the
combination electrode with deionized water.
8 If necessary, set the temperature of the second buffer solution
with <▲><▼>.
9Immerse the combination electrode in the second buffer
solution.
10 Press the <ENTER> key. The second pH value appears on the
display.
11 When the measured value is stable,
using <▲><▼>, set the measured value to the nominal pH
value of the buffer solution (at the current temperature).
12 Press the <ENTER> key.
The value of the zero point (ASY) is displayed.
13 Press the <ENTER> key.
The value of the slope (SLO) is displayed.
14 Press the <ENTER> key.
The measuring mode is active.
pH 3110 Operation
27
ba75791e05 05/2011
4.4 Downloading calibration data
You can download calibration data to the display as follows:
Note
While the calibration data is displayed you can press <▲><▼> to
switch over the unit of the zero point (ASY).
Note
While the calibration data is displayed you can press <▲><▼> to
switch over the unit of the slope (SLO).
1Pressing <CAL_> displays the calibration data (asymmetry).
2With <ENTER> display the slope.
y
S
A
2
0
mV
ConCal
O
L
S
2
9
mV/pH
ConCal
5-
Operation pH 3110
28 ba75791e05 05/2011
4.5 Settings
You can adapt the meter to your individual requirements. The settings
are done in the following menus:
-System settings (<ENTER_>)
– Switch-off interval (t.Off)
-Measurement settings (<M_>)
– Display of the buffer during calibration
(pH nominal value or measured voltage value in mV)
– Unit of the value for the slope (mV/pH or %)
– Unit of the value for the zero point (mV, pH)
– Measured value resolution, pH (0.000 / 0.00 / 0.0)
– Measured value resolution, U (0.0 / 0)
– Temperature unit (°C / °F)
– Calibration interval (Int.C [0 ... 999])
Note
You can exit the setting menu at any time by pressing <M>. Settings
already modified and confirmed with <ENTER> are stored.
pH 3110 Operation
29
ba75791e05 05/2011
4.5.1 System settings
The default setting is printed in bold.
Switch-off interval (t.Off)
Switch-off interval (t.Off) 10, 20, 30, 40, 50 min,
1, 2, 3, 4, 5, 10, 15, 20, 24 h
1Open the menu for system settings with <ENTER_>.
The first system setting is displayed.
2Set the switch-off interval with <▲><▼>.
3 Confirm with <ENTER>.
The system settings are completed.
The meter switches to the measuring mode.
0
00
1
f
f
O
t
Time
Operation pH 3110
30 ba75791e05 05/2011
4.5.2 Measurement settings
These settings apply to calibration and measurement (the default
setting is printed in bold).
Display during
calibration
(bUFF)
Display during calibration (BUFFER)pH (buffer nominal value),
U (combination electrode
voltage)
Unit of the value for the slope (SLO)mV/pH, %
Unit of the value for the zero point
(ASY)
mV, pH
Measured value resolution, pH 0.000 , 0.00 , 0.0
Measured value resolution, U 0.0 , 0
Temperature unit (UnIt)°C, °F
Calibration interval (Int.C) 0 ... 7 ... 999 d
1With <M_> open the menu for measurement and calibration
settings.
The first setting is displayed.
2Using <▲><▼>, select the pH or U display during calibration.
3 Confirm with <ENTER>.
SLO, the unit of the value for the slope (mV/pH or %) is
displayed.
pH 3110 Operation
31
ba75791e05 05/2011
Unit of the value for the
slope
(SLO)
Unit of the value for the
zero point
(ASY)
4Using <▲><▼>, select the unit for the slope.
5 Confirm with <ENTER>.
ASY, the unit of the value for the zero point (mV or pH) is
displayed.
6Using <▲><▼>, select the unit for the zero point.
7 Confirm with <ENTER>.
res, the resolution of the pH display
(0.0, 0.00 or 0.000) appears on the display.
Operation pH 3110
32 ba75791e05 05/2011
pH resolution
(res)
U resolution
(res)
8Select the resolution for the pH display with <▲><▼>.
9 Confirm with <ENTER>.
res, the resolution of the voltage display (0.0, 0.00 or 0.000)
appears on the display.
10 Using <▲><▼>, select the unit for the voltage display.
11 Confirm with <ENTER>.
Unit, the setting of the unit of the temperature value is
displayed.
pH 3110 Operation
33
ba75791e05 05/2011
Temperature unit (Unit)
Calibration
interval
(Int.C)
12 Using <▲><▼>, toggle between °C and °F.
13 Confirm with <ENTER>.
Int.C, the setting of the calibration interval is displayed.
14 Set the interval with <▲><▼>.
15 Confirm with <ENTER>.
The measurement settings are completed.
The meter switches to the measuring mode.
Operation pH 3110
34 ba75791e05 05/2011
4.6 Reset
4.6.1 Resetting calibration values
This function resets the calibration values to the default condition. All
other meter settings are retained.
Calibration values in the
default condition
Note
The measuring system is not calibrated after a reset. Before
measuring, recalibrate the meter.
Resetting calibration
values
Zero point 0 mV (pH 7.000)
Slope -59.16 mV/pH (100 %)
1Press <On/Off_> to open the menu for the reset of the
calibration data.
Init.C is displayed.
2Press <▲><▼> to display no or YES.
YES: Reset the calibration values.
no: Retain the calibration values.
3 Confirm with <ENTER>.
The menu is finished.
The meter switches to the measuring mode.
pH 3110 Operation
35
ba75791e05 05/2011
4.6.2 Resetting all meter settings
This function resets all meter settings to the default condition. The
relevant values are given in the following sections:
Resetting the meter
settings
Note
The measuring system is not calibrated after a reset. Before
measuring, recalibrate the meter.
System settings section 4.5.1
Measurement settings section 4.5.2
1Switch on the meter with <On/Off>.
The display test appears briefly on the display.
2 During the display test, press <M> to open the menu for the
reset of the meter settings.
Init is displayed.
3Press <▲><▼> to display no or YES.
YES: Reset the meter settings.
no: Retain the meter settings.
4 Confirm with <ENTER>.
The menu is finished.
The meter switches to the measuring mode.
Operation pH 3110
36 ba75791e05 05/2011
pH 3110 Maintenance, cleaning, disposal
37
ba75791e05 05/2011
5 Maintenance, cleaning, disposal
5.1 Maintenance
The only maintenance activity required is replacing the batteries.
Note
See the relevant operating manuals of the combination electrodes for
instructions on maintenance.
5.1.1 Replacing the batteries
Note
Alternatively, you can also use Ni-MH rechargeable batteries (type
Mignon AA). In order to charge the batteries, an external charging
device is required.
Caution
Make sure that the poles of the batteries are positioned correctly.
The ± signs on the batteries must correspond to the ± signs in the
battery compartment.
1Unscrew the two screws (1) on the underside of the meter.
2 Open the battery compartment (2) on the underside of the
meter.
3Remove the four batteries from the battery compartment.
4 Place four new batteries (type Mignon AA) in the battery
compartment.
2
1
Maintenance, cleaning, disposal pH 3110
38 ba75791e05 05/2011
5.2 Cleaning
Occasionally wipe the outside of the meter with a damp, lint-free cloth.
Disinfect the housing with isopropanol as required.
Caution
The housing is made of synthetic material (ABS). Thus, avoid
contact with acetone or similar detergents that contain solvents.
Remove any splashes immediately.
5.3 Packing
This meter is sent out in a protective transport packing.
We recommend: Keep the packing material. The original packing
protects the meter against damage during transport.
5.4 Disposal
Note
This meter contains batteries. Batteries that have been removed must
only be disposed of at a recycling facility set up for this purpose or via
the retail outlet.
It is illegal to dispose of them in household refuse.
5Close the battery compartment (2) and tighten the screws (1).
pH 3110 What to do if...
39
ba75791e05 05/2011
6 What to do if...
Error message
OFL, UFL
Error message
CalError
Cause Remedy
pH combination electrode:
– Measured value outside the
measuring range
– Use suitable combination
electrode
– Air bubble in front of the
diaphragm
– Remove air bubble
– Air in the diaphragm – Extract air or moisten
diaphragm
– Cable broken – Replace combination
electrode
– Gel electrolyte dried out – Replace combination
electrode
Cause Remedy
pH combination electrode:
– The values determined for zero
point and slope of the
combination electrode are
outside the allowed limits.
– Recalibrate
– Diaphragm contaminated – Clean diaphragm
– Combination electrode broken – Replace combination
electrode
Buffer solutions
– Incorrect buffer solutions – Change calibration
procedure
– Buffer solutions too old – Use only once.
Note the shelf life
– Buffer solutions depleted – Change solutions
What to do if... pH 3110
40 ba75791e05 05/2011
No stable measured
value
Sensor symbol flashes
Display,
LoBat
Cause Remedy
pH combination electrode:
– Diaphragm contaminated – Clean diaphragm
– Membrane contaminated – Clean membrane
Test sample:
– pH value not stable – Measure with air excluded if
necessary
– Temperature not stable – Adjust temperature if
necessary
Combination electrode + test
sample:
– Conductivity too low – Use suitable combination
electrode
– Temperature too high – Use suitable combination
electrode
– Organic liquids – Use suitable combination
electrode
Cause Remedy
– Calibration interval expired – Recalibrate the measuring
system
Cause Remedy
– Batteries almost empty – Replace the batteries (see
section 5.1 MAINTENANCE)
pH 3110 What to do if...
41
ba75791e05 05/2011
Obviously incorrect
measured values
Meter does not react to
keystroke
You want to know which
software
version is in the meter
Cause Remedy
pH combination electrode:
– pH combination electrode
unsuitable
– Use suitable combination
electrode
– Temperature difference
between buffer and test sample
too high
– Adjust temperature of buffer
or sample solutions
– Measurement procedure not
suitable
– Follow special procedure
Cause Remedy
– Operating condition undefined
or EMC load unallowed
– Processor reset:
Press the <ENTER> and
<On/Off> key
simultaneously
Cause Remedy
– E. g., a question by the service
department
– Switch on the meter.
During the display test,
display the software version
with <ENTER>.
What to do if... pH 3110
42 ba75791e05 05/2011
pH 3110 Technical data
43
ba75791e05 05/2011
7 Technical data
7.1 General data
Dimensions approx. 180 x 80 x 55 mm
Weight approx. 0.4 kg
Mechanical structure Type of protection IP 67
Electrical safety Protective class III
Test certificates CE, cETLus
Ambient
conditions
Storage - 25 °C ... + 65 °C
Operation -10 °C ... + 55 °C
Allowable relative
humidity
Annual mean: < 75 %
30 days/year: 95 %
Other days: 85 %
Power
supply
Batteries 4 x 1.5 V alkali-manganese batteries,
type AA
Rechargeable
batteries
4 x 1,2 V NiMH rechargeable batteries,
type AA
(no charging function)
Operational life Approx. 2500 h operating hours (batteries)
Sensor input Input resistance > 5 * 1012 ohm
Input current < 1 * 10-12 A
Guidelines
and norms used
EMC EC directive 2004/108/EC
EN 61326-1
EN 61000-3-2
EN 61000-3-3
FCC Class A
Meter safety EC directive 2006/95/EC
EN 61010-1
IP protection EN 60529
Technical data pH 3110
44 ba75791e05 05/2011
7.2 Measuring ranges, resolution, accuracy
Note
The accuracy values specified here apply exclusively to the meter. The
accuracy of the combination electrodes and buffer solutions has to be
taken into account additionally.
Measuring ranges,
resolution
Variable Measuring range Resolution
pH - 2.0 ... + 20.0 0.1
- 2.00 ... + 20.00 0.01
- 2.000 ... + 19.999 0.001
U [mV] - 1200.0 ... + 1200.0 0.1
- 2000 ... + 2000 1
T [°C] - 5.0 ... + 105.0 0.1
T [°F] 23.0 ... + 221.0 0.1
Manual
temperature input
Variable Range Increment
Tmanual [°C] - 25 ... + 130 1
Tmanual [°F] -13 ... + 266 1
Accuracy (± 1 digit) Variable Accuracy Temperature of the test
sample
pH / range *
- 2.0 ... + 20.0 ± 0.1 + 15 °C ... + 35 °C
- 2.00 ... + 20.00 ± 0.01 + 15 °C ... + 35 °C
- 2.000 ... + 19.999 ± 0.005 + 15 °C ... + 35 °C
U [mV] / range
- 2000 ... + 2000 ± 1 + 15 °C ... + 35 °C
-1200.0 ... +1200.0 ± 0.3 + 15 °C ... + 35 °C
T [°C] / temperature sensor
NTC 30 ± 0.1
PT 1000 ± 0.1
* when measuring in a range of ± 2 pH around a calibration point
pH 3110 Lists
45
ba75791e05 05/2011
8Lists
This chapter provides additional information and orientation aids.
Specialist terms The glossary briefly explains the meaning of the specialist terms.
However, terms that should already be familiar to the target group are
not described here.
Index The index helps you to find the topics that you are looking for.
Glossary
Adjusting To manipulate a measuring system so that the relevant value (e. g. the
displayed value) differs as little as possible from the correct value or
a value that is regarded as correct, or that the difference remains
within the tolerance.
Asymmetry see zero point
AutoRange Name of the automatic selection of the measuring range.
AutoRead Function to control the measured value stability.
Calibration Comparing the value from a measuring system (e. g. the displayed
value) to the correct value or a value that is regarded as correct.
Often, this expression is also used when the measuring system is
adjusted at the same time (see adjusting).
Electromotive force of
a combination
electrode
The electromotive force U of the combination electrode is the
measurable electromotive force of an electrode in a solution. It equals
the sum of all the galvanic voltages of the electrode. Its dependency
on the pH results in the electrode function, which is characterized by
the parameters, slope and zero point.
Junction The junction is a porous body in the housing wall of reference
electrodes or electrolyte bridges. It arranges the electrical contact
between two solutions and makes the electrolyte exchange more
difficult. The expression, junction, is also used for ground or junction-
less transitions.
Measured parameter The measured parameter is the physical dimension determined by
measuring, e. g. pH, conductivity or D.O. concentration.
Lists pH 3110
46 ba75791e05 05/2011
Measured value The measured value is the special value of a measured parameter to
be determined. It is given as a combination of the numerical value and
unit (e. g. 3 m; 0.5 s; 5.2 A; 373.15 K).
Molality Molality is the quantity (in Mol) of a dissolved substance in 1000 g
solvent.
ORP voltage The ORP is caused by oxidizing or reducing substances dissolved in
water, if these substances become effective at an electrode surface
(e. g. a gold or platinum surface).
pH value The pH is a measure of the acidic or basic effect of an aqueous
solution. It corresponds to the negative decadic logarithm of the molal
hydrogen ions activity divided by the unit of the molality. The practical
pH value is the value of a pH measurement.
Potentiometry Name of a measuring technique. The signal (depending on the
measured parameter) of the electrode is the electrical potential. The
electrical current remains constant.
Reset Restoring the original condition of all settings of a measuring system.
Resolution Smallest difference between two measured values that can be
displayed by a measuring instrument.
Slope The slope of a linear calibration function.
Standard solution The standard solution is a solution where the measured value is
known by definition. It is used to calibrate a measuring system.
Test sample Designation of the test sample ready to be measured. Normally, a test
sample is made by processing the original sample. The test sample
and original sample are identical if the test sample was not processed.
Zero point The zero point of a pH electrode is the pH value at which the
electromotive force of the pH electrode at a specified temperature is
zero. Normally, this is at 25 °C.
pH 3110 Lists
Index
47
ba75791e05 05/2011
A
Authorized use . . . . . . . . . . . . . . . . . . . . . . 10
AutoCal . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
AutoRead . . . . . . . . . . . . . . . . . . . . . . . . . . 16
B
Battery compartment . . . . . . . . . . . . . . 13, 37
C
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . 19
Calibration evaluation
pH . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Calibration interval . . . . . . . . . . . . . . . . . . . 21
Calibration points
pH . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
ConCal . . . . . . . . . . . . . . . . . . . . . . . . . 19, 24
D
Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
E
Energy saving feature . . . . . . . . . . . . . . . . 14
I
Initial commissioning . . . . . . . . . . . . . . . . . 14
Interval
Calibration . . . . . . . . . . . . . . . . . . . . . . 21
K
Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
L
LoBat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
M
Measurement accuracy . . . . . . . . . . . . . . . 21
O
Operational safety . . . . . . . . . . . . . . . . . . . 10
ORP electrode . . . . . . . . . . . . . . . . . . . . . . 18
ORP voltage . . . . . . . . . . . . . . . . . . . . . . . . 18
P
Precautions . . . . . . . . . . . . . . . . . . . . . . . . . 9
R
Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
All meter settings . . . . . . . . . . . . . . . . . 35
Calibration values . . . . . . . . . . . . . . . . 34
Resolution setting . . . . . . . . . . . . . 30, 31, 32
S
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Scope of delivery . . . . . . . . . . . . . . . . . . . . 13
Single-point calibration . . . . . . . . . 19, 23, 25
Slope
pH . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Socket field . . . . . . . . . . . . . . . . . . . . . . . . . 8
Stability control . . . . . . . . . . . . . . . . . . . . . 16
T
Two-point calibration . . . . . . . . . . . . . . . . . 19
ConCal . . . . . . . . . . . . . . . . . . . . . . . . . 24
Z
Zero point of pH combination electrode . . . 19
Lists pH 3110
48 ba75791e05 05/2011
Wissenschaftlich-Technische Werkstätten GmbH
Dr.-Karl-Slevogt-Straße 1
D-82362 Weilheim
Germany
Tel: +49 (0) 881 183-0
+49 (0) 881 183-100
Fax: +49 (0) 881 183-420
E-Mail: Info@WTW.com
Internet: http://www.WTW.com

Navigation menu